Stash is slow
I belive the stash is being stored on Opera servers. When I switch to the stash slide with just 3 stashes in there it takes several seconds before the stashes appear. That's far too slow! Please store them locally, they need to be available as quick as bookmarks, otherwhise they are useless.
Also I think they are too large. Just 2,5 stashes fit on my screen and I fear I will have to scroll when I add more. Stashes are the most frequently visited bookmarks to me, I need to access them as quickly as possible.